Coreg CR ( carvedilol) was prescribed at 80mg because of your high blood pressure on presentation in emergency. Stopping of the earlier medication lotrel(amlodipine+benazepril) abruptly has resulted in such a high blood pressure. Never stop hypertensive medications abruptly. It can shoot up the blood pressure and cause dangerous consequences. Now you have concern regarding high dose, you need to take these two points in consideration while thinking of 80mg as a high dose -Lotrel that was used for control earlier is a fixed dose combination of two drugs - you had two different drugs controlling your blood pressure -Your blood pressure shot upto 170/122 which certainly warrants the use of such high dosages Now I would suggest you to undergo regular blood pressure check ups and if your blood pressure or heart rate is going below normal, then definitely there can be a reduction in dose.